| /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
| |
| /*** |
| This file is part of systemd. |
| |
| Copyright 2013 Tom Gundersen <teg@jklm.no> |
| |
| systemd is free software; you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published by |
| the Free Software Foundation; either version 2.1 of the License, or |
| (at your option) any later version. |
| |
| systemd is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with systemd; If not, see <http://www.gnu.org/licenses/>. |
| ***/ |
| |
| #include <netinet/in.h> |
| #include <stdbool.h> |
| #include <unistd.h> |
| |
| #include "util.h" |
| #include "socket-util.h" |
| #include "formats-util.h" |
| #include "refcnt.h" |
| #include "missing.h" |
| |
| #include "sd-netlink.h" |
| #include "netlink-util.h" |
| #include "netlink-internal.h" |
| #include "netlink-types.h" |
| |
| #define GET_CONTAINER(m, i) ((i) < (m)->n_containers ? (struct rtattr*)((uint8_t*)(m)->hdr + (m)->container_offsets[i]) : NULL) |
| #define PUSH_CONTAINER(m, new) (m)->container_offsets[(m)->n_containers ++] = (uint8_t*)(new) - (uint8_t*)(m)->hdr; |
| |
| #define RTA_TYPE(rta) ((rta)->rta_type & NLA_TYPE_MASK) |
| |
| int message_new_empty(sd_netlink *rtnl, sd_netlink_message **ret) { |
| sd_netlink_message *m; |
| |
| assert_return(ret, -EINVAL); |
| |
| /* Note that 'rtnl' is currently unused, if we start using it internally |
| we must take care to avoid problems due to mutual references between |
| buses and their queued messages. See sd-bus. |
| */ |
| |
| m = new0(sd_netlink_message, 1); |
| if (!m) |
| return -ENOMEM; |
| |
| m->n_ref = REFCNT_INIT; |
| |
| m->sealed = false; |
| |
| *ret = m; |
| |
| return 0; |
| } |
| |
| int message_new(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t type) { |
| _cleanup_netlink_message_unref_ sd_netlink_message *m = NULL; |
| const NLType *nl_type; |
| size_t size; |
| int r; |
| |
| r = type_system_get_type(NULL, &nl_type, type); |
| if (r < 0) |
| return r; |
| |
| r = message_new_empty(rtnl, &m); |
| if (r < 0) |
| return r; |
| |
| size = NLMSG_SPACE(nl_type->size); |
| |
| assert(size >= sizeof(struct nlmsghdr)); |
| m->hdr = malloc0(size); |
| if (!m->hdr) |
| return -ENOMEM; |
| |
| m->hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; |
| |
| m->container_type_system[0] = nl_type->type_system; |
| m->hdr->nlmsg_len = size; |
| m->hdr->nlmsg_type = type; |
| |
| *ret = m; |
| m = NULL; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_request_dump(sd_netlink_message *m, int dump) { |
| assert_return(m, -EINVAL); |
| assert_return(m->hdr, -EINVAL); |
| assert_return(m->hdr->nlmsg_type == RTM_GETLINK || |
| m->hdr->nlmsg_type == RTM_GETADDR || |
| m->hdr->nlmsg_type == RTM_GETROUTE || |
| m->hdr->nlmsg_type == RTM_GETNEIGH, |
| -EINVAL); |
| |
| if (dump) |
| m->hdr->nlmsg_flags |= NLM_F_DUMP; |
| else |
| m->hdr->nlmsg_flags &= ~NLM_F_DUMP; |
| |
| return 0; |
| } |
| |
| sd_netlink_message *sd_netlink_message_ref(sd_netlink_message *m) { |
| if (m) |
| assert_se(REFCNT_INC(m->n_ref) >= 2); |
| |
| return m; |
| } |
| |
| sd_netlink_message *sd_netlink_message_unref(sd_netlink_message *m) { |
| if (m && REFCNT_DEC(m->n_ref) == 0) { |
| unsigned i; |
| |
| free(m->hdr); |
| |
| for (i = 0; i <= m->n_containers; i++) |
| free(m->rta_offset_tb[i]); |
| |
| sd_netlink_message_unref(m->next); |
| |
| free(m); |
| } |
| |
| return NULL; |
| } |
| |
| int sd_netlink_message_get_type(sd_netlink_message *m, uint16_t *type) { |
| assert_return(m, -EINVAL); |
| assert_return(type, -EINVAL); |
| |
| *type = m->hdr->nlmsg_type; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_is_broadcast(sd_netlink_message *m) { |
| assert_return(m, -EINVAL); |
| |
| return m->broadcast; |
| } |
| |
| /* If successful the updated message will be correctly aligned, if |
| unsuccessful the old message is untouched. */ |
| static int add_rtattr(sd_netlink_message *m, unsigned short type, const void *data, size_t data_length) { |
| uint32_t rta_length; |
| size_t message_length, padding_length; |
| struct nlmsghdr *new_hdr; |
| struct rtattr *rta; |
| char *padding; |
| unsigned i; |
| int offset; |
| |
| assert(m); |
| assert(m->hdr); |
| assert(!m->sealed); |
| assert(NLMSG_ALIGN(m->hdr->nlmsg_len) == m->hdr->nlmsg_len); |
| assert(!data || data_length); |
| |
| /* get offset of the new attribute */ |
| offset = m->hdr->nlmsg_len; |
| |
| /* get the size of the new rta attribute (with padding at the end) */ |
| rta_length = RTA_LENGTH(data_length); |
| |
| /* get the new message size (with padding at the end) */ |
| message_length = offset + RTA_ALIGN(rta_length); |
| |
| /* realloc to fit the new attribute */ |
| new_hdr = realloc(m->hdr, message_length); |
| if (!new_hdr) |
| return -ENOMEM; |
| m->hdr = new_hdr; |
| |
| /* get pointer to the attribute we are about to add */ |
| rta = (struct rtattr *) ((uint8_t *) m->hdr + offset); |
| |
| /* if we are inside containers, extend them */ |
| for (i = 0; i < m->n_containers; i++) |
| GET_CONTAINER(m, i)->rta_len += message_length - offset; |
| |
| /* fill in the attribute */ |
| rta->rta_type = type; |
| rta->rta_len = rta_length; |
| if (data) |
| /* we don't deal with the case where the user lies about the type |
| * and gives us too little data (so don't do that) |
| */ |
| padding = mempcpy(RTA_DATA(rta), data, data_length); |
| else { |
| /* if no data was passed, make sure we still initialize the padding |
| note that we can have data_length > 0 (used by some containers) */ |
| padding = RTA_DATA(rta); |
| } |
| |
| /* make sure also the padding at the end of the message is initialized */ |
| padding_length = (uint8_t*)m->hdr + message_length - (uint8_t*)padding; |
| memzero(padding, padding_length); |
| |
| /* update message size */ |
| m->hdr->nlmsg_len = message_length; |
| |
| return offset; |
| } |
| |
| static int message_attribute_has_type(sd_netlink_message *m, uint16_t attribute_type, uint16_t data_type) { |
| const NLType *type; |
| int r; |
| |
| r = type_system_get_type(m->container_type_system[m->n_containers], &type, attribute_type); |
| if (r < 0) |
| return r; |
| |
| if (type->type != data_type) |
| return -EINVAL; |
| |
| return type->size; |
| } |
| |
| int sd_netlink_message_append_string(sd_netlink_message *m, unsigned short type, const char *data) { |
| size_t length, size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_STRING); |
| if (r < 0) |
| return r; |
| else |
| size = (size_t)r; |
| |
| if (size) { |
| length = strnlen(data, size+1); |
| if (length > size) |
| return -EINVAL; |
| } else |
| length = strlen(data); |
| |
| r = add_rtattr(m, type, data, length + 1); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u8(sd_netlink_message *m, unsigned short type, uint8_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, type, NLA_U8); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, &data, sizeof(uint8_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| |
| int sd_netlink_message_append_u16(sd_netlink_message *m, unsigned short type, uint16_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, type, NLA_U16); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, &data, sizeof(uint16_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_u32(sd_netlink_message *m, unsigned short type, uint32_t data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = message_attribute_has_type(m, type, NLA_U32); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, &data, sizeof(uint32_t)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_in_addr(sd_netlink_message *m, unsigned short type, const struct in_addr *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, data, sizeof(struct in_addr)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_in6_addr(sd_netlink_message *m, unsigned short type, const struct in6_addr *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, data, sizeof(struct in6_addr)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_ether_addr(sd_netlink_message *m, unsigned short type, const struct ether_addr *data) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, data, ETH_ALEN); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_append_cache_info(sd_netlink_message *m, unsigned short type, const struct ifa_cacheinfo *info) { |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(info, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_CACHE_INFO); |
| if (r < 0) |
| return r; |
| |
| r = add_rtattr(m, type, info, sizeof(struct ifa_cacheinfo)); |
| if (r < 0) |
| return r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_open_container(sd_netlink_message *m, unsigned short type) { |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -ERANGE); |
| |
| r = message_attribute_has_type(m, type, NLA_NESTED); |
| if (r < 0) { |
| const NLTypeSystemUnion *type_system_union; |
| int family; |
| |
| r = message_attribute_has_type(m, type, NLA_UNION); |
| if (r < 0) |
| return r; |
| size = (size_t) r; |
| |
| r = sd_rtnl_message_get_family(m, &family); |
| if (r < 0) |
| return r; |
| |
| r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); |
| if (r < 0) |
| return r; |
| |
| r = type_system_union_protocol_get_type_system(type_system_union, |
| &m->container_type_system[m->n_containers + 1], |
| family); |
| if (r < 0) |
| return r; |
| } else { |
| size = (size_t)r; |
| |
| r = type_system_get_type_system(m->container_type_system[m->n_containers], |
| &m->container_type_system[m->n_containers + 1], |
| type); |
| if (r < 0) |
| return r; |
| } |
| |
| r = add_rtattr(m, type | NLA_F_NESTED, NULL, size); |
| if (r < 0) |
| return r; |
| |
| m->container_offsets[m->n_containers ++] = r; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_open_container_union(sd_netlink_message *m, unsigned short type, const char *key) { |
| const NLTypeSystemUnion *type_system_union; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| |
| r = type_system_get_type_system_union(m->container_type_system[m->n_containers], &type_system_union, type); |
| if (r < 0) |
| return r; |
| |
| r = type_system_union_get_type_system(type_system_union, |
| &m->container_type_system[m->n_containers + 1], |
| key); |
| if (r < 0) |
| return r; |
| |
| r = sd_netlink_message_append_string(m, type_system_union->match, key); |
| if (r < 0) |
| return r; |
| |
| /* do we evere need non-null size */ |
| r = add_rtattr(m, type, NULL, 0); |
| if (r < 0) |
| return r; |
| |
| m->container_offsets[m->n_containers ++] = r; |
| |
| return 0; |
| } |
| |
| |
| int sd_netlink_message_close_container(sd_netlink_message *m) { |
| assert_return(m, -EINVAL); |
| assert_return(!m->sealed, -EPERM); |
| assert_return(m->n_containers > 0, -EINVAL); |
| |
| m->container_type_system[m->n_containers] = NULL; |
| m->n_containers --; |
| |
| return 0; |
| } |
| |
| int rtnl_message_read_internal(sd_netlink_message *m, unsigned short type, void **data) { |
| struct rtattr *rta; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->sealed, -EPERM); |
| assert_return(data, -EINVAL); |
| assert(m->n_containers <= RTNL_CONTAINER_DEPTH); |
| assert(m->rta_offset_tb[m->n_containers]); |
| assert(type < m->rta_tb_size[m->n_containers]); |
| |
| if(!m->rta_offset_tb[m->n_containers][type]) |
| return -ENODATA; |
| |
| rta = (struct rtattr*)((uint8_t *) m->hdr + m->rta_offset_tb[m->n_containers][type]); |
| |
| *data = RTA_DATA(rta); |
| |
| return RTA_PAYLOAD(rta); |
| } |
| |
| int sd_netlink_message_read_string(sd_netlink_message *m, unsigned short type, const char **data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_STRING); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if (strnlen(attr_data, r) >= (size_t) r) |
| return -EIO; |
| |
| if (data) |
| *data = (const char *) attr_data; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_u8(sd_netlink_message *m, unsigned short type, uint8_t *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_U8); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t) r < sizeof(uint8_t)) |
| return -EIO; |
| |
| if (data) |
| *data = *(uint8_t *) attr_data; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_u16(sd_netlink_message *m, unsigned short type, uint16_t *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_U16); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t) r < sizeof(uint16_t)) |
| return -EIO; |
| |
| if (data) |
| *data = *(uint16_t *) attr_data; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_u32(sd_netlink_message *m, unsigned short type, uint32_t *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_U32); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t)r < sizeof(uint32_t)) |
| return -EIO; |
| |
| if (data) |
| *data = *(uint32_t *) attr_data; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_ether_addr(sd_netlink_message *m, unsigned short type, struct ether_addr *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_ETHER_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t)r < sizeof(struct ether_addr)) |
| return -EIO; |
| |
| if (data) |
| memcpy(data, attr_data, sizeof(struct ether_addr)); |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_cache_info(sd_netlink_message *m, unsigned short type, struct ifa_cacheinfo *info) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_CACHE_INFO); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t)r < sizeof(struct ifa_cacheinfo)) |
| return -EIO; |
| |
| if (info) |
| memcpy(info, attr_data, sizeof(struct ifa_cacheinfo)); |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_in_addr(sd_netlink_message *m, unsigned short type, struct in_addr *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t)r < sizeof(struct in_addr)) |
| return -EIO; |
| |
| if (data) |
| memcpy(data, attr_data, sizeof(struct in_addr)); |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_read_in6_addr(sd_netlink_message *m, unsigned short type, struct in6_addr *data) { |
| int r; |
| void *attr_data; |
| |
| assert_return(m, -EINVAL); |
| |
| r = message_attribute_has_type(m, type, NLA_IN_ADDR); |
| if (r < 0) |
| return r; |
| |
| r = rtnl_message_read_internal(m, type, &attr_data); |
| if (r < 0) |
| return r; |
| else if ((size_t)r < sizeof(struct in6_addr)) |
| return -EIO; |
| |
| if (data) |
| memcpy(data, attr_data, sizeof(struct in6_addr)); |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_enter_container(sd_netlink_message *m, unsigned short type) { |
| const NLType *nl_type; |
| const NLTypeSystem *type_system; |
| void *container; |
| size_t size; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->n_containers < RTNL_CONTAINER_DEPTH, -EINVAL); |
| |
| r = type_system_get_type(m->container_type_system[m->n_containers], |
| &nl_type, |
| type); |
| if (r < 0) |
| return r; |
| |
| if (nl_type->type == NLA_NESTED) { |
| r = type_system_get_type_system(m->container_type_system[m->n_containers], |
| &type_system, |
| type); |
| if (r < 0) |
| return r; |
| } else if (nl_type->type == NLA_UNION) { |
| const NLTypeSystemUnion *type_system_union; |
| |
| r = type_system_get_type_system_union(m->container_type_system[m->n_containers], |
| &type_system_union, |
| type); |
| if (r < 0) |
| return r; |
| |
| switch (type_system_union->match_type) { |
| case NL_MATCH_SIBLING: |
| { |
| const char *key; |
| |
| r = sd_netlink_message_read_string(m, type_system_union->match, &key); |
| if (r < 0) |
| return r; |
| |
| r = type_system_union_get_type_system(type_system_union, |
| &type_system, |
| key); |
| if (r < 0) |
| return r; |
| |
| break; |
| } |
| case NL_MATCH_PROTOCOL: |
| { |
| int family; |
| |
| r = sd_rtnl_message_get_family(m, &family); |
| if (r < 0) |
| return r; |
| |
| r = type_system_union_protocol_get_type_system(type_system_union, |
| &type_system, |
| family); |
| if (r < 0) |
| return r; |
| |
| break; |
| } |
| default: |
| assert_not_reached("sd-netlink: invalid type system union type"); |
| } |
| } else |
| return -EINVAL; |
| |
| r = rtnl_message_read_internal(m, type, &container); |
| if (r < 0) |
| return r; |
| else |
| size = (size_t)r; |
| |
| m->n_containers ++; |
| |
| r = rtnl_message_parse(m, |
| &m->rta_offset_tb[m->n_containers], |
| &m->rta_tb_size[m->n_containers], |
| type_system->max, |
| container, |
| size); |
| if (r < 0) { |
| m->n_containers --; |
| return r; |
| } |
| |
| m->container_type_system[m->n_containers] = type_system; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_exit_container(sd_netlink_message *m) { |
| assert_return(m, -EINVAL); |
| assert_return(m->sealed, -EINVAL); |
| assert_return(m->n_containers > 0, -EINVAL); |
| |
| free(m->rta_offset_tb[m->n_containers]); |
| m->rta_offset_tb[m->n_containers] = NULL; |
| m->container_type_system[m->n_containers] = NULL; |
| |
| m->n_containers --; |
| |
| return 0; |
| } |
| |
| uint32_t rtnl_message_get_serial(sd_netlink_message *m) { |
| assert(m); |
| assert(m->hdr); |
| |
| return m->hdr->nlmsg_seq; |
| } |
| |
| int sd_netlink_message_is_error(sd_netlink_message *m) { |
| assert_return(m, 0); |
| assert_return(m->hdr, 0); |
| |
| return m->hdr->nlmsg_type == NLMSG_ERROR; |
| } |
| |
| int sd_netlink_message_get_errno(sd_netlink_message *m) { |
| struct nlmsgerr *err; |
| |
| assert_return(m, -EINVAL); |
| assert_return(m->hdr, -EINVAL); |
| |
| if (!sd_netlink_message_is_error(m)) |
| return 0; |
| |
| err = NLMSG_DATA(m->hdr); |
| |
| return err->error; |
| } |
| |
| int rtnl_message_parse(sd_netlink_message *m, |
| size_t **rta_offset_tb, |
| unsigned short *rta_tb_size, |
| int max, |
| struct rtattr *rta, |
| unsigned int rt_len) { |
| unsigned short type; |
| size_t *tb; |
| |
| tb = new0(size_t, max + 1); |
| if(!tb) |
| return -ENOMEM; |
| |
| *rta_tb_size = max + 1; |
| |
| for (; RTA_OK(rta, rt_len); rta = RTA_NEXT(rta, rt_len)) { |
| type = RTA_TYPE(rta); |
| |
| /* if the kernel is newer than the headers we used |
| when building, we ignore out-of-range attributes |
| */ |
| if (type > max) |
| continue; |
| |
| if (tb[type]) |
| log_debug("rtnl: message parse - overwriting repeated attribute"); |
| |
| tb[type] = (uint8_t *) rta - (uint8_t *) m->hdr; |
| } |
| |
| *rta_offset_tb = tb; |
| |
| return 0; |
| } |
| |
| int sd_netlink_message_rewind(sd_netlink_message *m) { |
| const NLType *type; |
| unsigned i; |
| int r; |
| |
| assert_return(m, -EINVAL); |
| |
| /* don't allow appending to message once parsed */ |
| if (!m->sealed) |
| rtnl_message_seal(m); |
| |
| for (i = 1; i <= m->n_containers; i++) { |
| free(m->rta_offset_tb[i]); |
| m->rta_offset_tb[i] = NULL; |
| m->rta_tb_size[i] = 0; |
| m->container_type_system[i] = NULL; |
| } |
| |
| m->n_containers = 0; |
| |
| if (m->rta_offset_tb[0]) { |
| /* top-level attributes have already been parsed */ |
| return 0; |
| } |
| |
| assert(m->hdr); |
| |
| r = type_system_get_type(NULL, &type, m->hdr->nlmsg_type); |
| if (r < 0) |
| return r; |
| |
| if (type->type == NLA_NESTED) { |
| const NLTypeSystem *type_system = type->type_system; |
| |
| assert(type_system); |
| |
| m->container_type_system[0] = type_system; |
| |
| r = rtnl_message_parse(m, |
| &m->rta_offset_tb[m->n_containers], |
| &m->rta_tb_size[m->n_containers], |
| type_system->max, |
| (struct rtattr*)((uint8_t*)NLMSG_DATA(m->hdr) + |
| NLMSG_ALIGN(type->size)), |
| NLMSG_PAYLOAD(m->hdr, type->size)); |
| if (r < 0) |
| return r; |
| } |
| |
| return 0; |
| } |
| |
| void rtnl_message_seal(sd_netlink_message *m) { |
| assert(m); |
| assert(!m->sealed); |
| |
| m->sealed = true; |
| } |
| |
| sd_netlink_message *sd_netlink_message_next(sd_netlink_message *m) { |
| assert_return(m, NULL); |
| |
| return m->next; |
| } |